NOTES: This analysis was done independently by an engineer after successful completion of the course Statistics and Principles of Tolerance . The initial evaluation of the assembly and the airstream, using Crystal Ball software, demonstrated that the design did not meet specification. Moreover, the sensitivity analysis showed that most of the variability was the result of one dimension. Possible design changes were modeled in Crystal Ball to determine what, if any, the proposed change would have on overall variability. The final design of this interface reduced variability from 0.075 to 0.016. The final sensitivity analysis shows that the feature which was responsible for nearly 90% of overall variability in the initial design had been reduced to 40% in the final design.